Next...a motorized bed. That would be nice. But, seriously, patent that thing and sell it. I'd pay to have one of those in my house. Stairs could be a problem, though (two sets in my house). Well, it's not so much going
down the stairs that's the problem; that's easy. It's going back
up again that's the hard part.
EDIT: I'm not sure you could patent it, though, because it's basically a chair converted into a wheelchair. But it would be cool if you could sell it. Add some temur pedic and you'd have the most comfortable robot chair out there.
Just a note: I am not, in any way, sponsoring Tempur Pedic or any other thing related to or in possesion of Sweden.